e) \(\left(x+3\right)^3=\left(2x\right)^3\)

\(\Rightarrow x+3=2x\)

\(\Rightarrow2x-x=3\)

\(\Rightarrow x=3\)

f) \(\left(5-x\right)^5=32\)

\(\Rightarrow\left(5-x\right)^5=2^5\)

\(\Rightarrow5-x=2\)

\(\Rightarrow x=5-2\)

\(\Rightarrow x=3\)

g) \(\left(5x-6\right)^3=64\)

\(\Rightarrow\left(5x-6\right)^3=4^3\)

\(\Rightarrow5x-6=4\)

\(\Rightarrow5x=4+6\)

\(\Rightarrow5x=10\)

\(\Rightarrow x=\dfrac{10}{2}\)

\(\Rightarrow x=5\)

h) \(5\cdot9^x=405\)

\(\Rightarrow9^x=\dfrac{405}{5}\)

\(\Rightarrow9^x=81\)

\(\Rightarrow9^x=9^2\)

\(\Rightarrow x=2\)

i) \(11^5:11^{n-2}=11^5\)

\(\Rightarrow11^{n-2}=11^5:11^5\)

\(\Rightarrow11^{n-2}=1\)

\(\Rightarrow11^{n-2}=11^0\)

\(\Rightarrow n-2=0\)

\(\Rightarrow n=2\)

k) \(\left(3x\right)^3=\left(2x+1\right)^3\)

\(\Rightarrow3x=2x+1\)

\(\Rightarrow3x-2x=1\)

\(\Rightarrow x=1\)

\(\left(2x-5\right).\left(4-3x\right)-\left(3x+11\right).\left(5-2x\right)-15\left(2x-5\right)\)

\(=\)\(\left(2x-5\right).\left(4-3x\right)+\left(3x+11\right).\left(2x-5\right)-15\left(2x-5\right)\)

\(=\left(2x-5\right).\left(4-3x+3x+11-15\right)\)

\(=\left(2x-5\right).0\)

\(=0\)

(2x-5).(4x-3x)-(3x+11).(5-2x)+5.(2x-5)

=(2x-5).x+(3x+11).(2x-5)+5(2x-5)

=(2x-5)(x+3x+11+5)

=(2x-5)(4x+16)

=8x²+32x-20x-80

=8x²+12x-80

giải

(2x-5).(4-3x)-(3x+11).(5-2x)-15.(2x-5)

8x-6x^2-20+15x-(15x-6x^2+55-22x)-30x+75

8x-6x^2-20+15x-15x+6x^2-55+22x-30x+75

(8x+15x-15x+22x-30x)+(-6x^2+6x^2)+(-20-55+75)

0+0+0=0

chúc bạn học tốt nha

25/7nha

b: \(B=2x\left(x-3\right)-\left(2x-2\right)\left(x-2\right)\)

\(=2x^2-6x-2x^2+4x+2x-4\)

=-4

=> 2x-11 bằng 1 hoặc 0
=> x= 6 hoặc 11/2

(2x-11):3+11=4

(2x-11):3=15

2x-11=5

2x=16

x=8

[(2x - 11) : 3 + 1] × 5 = 20

  (2x - 11) : 3 + 1        = 20 : 5

  (2x - 11) : 3 + 1        = 4

  (2x - 11) : 3               = 4 - 1

  (2x - 11) : 3               = 3

   2x - 11                      = 3 × 3

   2x - 11                      = 9

   2x                             = 9 + 11

   2x                             = 20

    x                              = 20 : 2

    x                              = 10

Vậy x = 10

                      ~ Học tốt ~               .❤

\(a.x=-0,6\)

\(c.x=-11,6\)

Pt nhju ak!!!

\(\frac{22}{25}\times\frac{5}{11}-\frac{33}{25}:\frac{11}{5}+\frac{58}{11}\)

\(=\frac{22}{25}\times\frac{5}{11}-\frac{33}{25}\times\frac{5}{11}+\frac{58}{11}\)

\(=\frac{5}{11}\times\left(\frac{22}{25}+\frac{33}{25}\right)+\frac{58}{11}\)

\(=\frac{5}{11}\times\frac{11}{5}+\frac{58}{11}\)

\(=1+\frac{58}{11}\)

\(=\frac{11}{11}+\frac{58}{11}\)

\(=\frac{69}{11}\)

\(8\frac{3}{11}-\left(3\frac{5}{7}-7\frac{8}{11}\right)\)

\(=\frac{91}{11}-\left(\frac{26}{7}-\frac{85}{11}\right)\)

\(=\frac{91}{11}-\frac{26}{7}+\frac{85}{11}\)

\(=\frac{91}{11}+\frac{85}{11}-\frac{26}{7}\)

\(=16-\frac{26}{7}\)

\(=\frac{86}{7}\)

\(\frac{5}{6}x+325\%=\frac{3}{2}x-30,75\)

\(=>\frac{5}{6}x+3,25=\frac{3}{2}x-30,75\)

\(=>\frac{5}{6}x-\frac{3}{2}x=-30,75-3,25\)

\(=>\frac{-2}{3}x=-34\)

\(=>x=-34:\left(-\frac{2}{3}\right)\)

\(=>x=-34.\left(\frac{3}{-2}\right)\)

\(=>x=51\)